Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Solum" Definition
noun
The upper layers of a soil profile in which topsoil formation occurs.
Source: American Heritage Dictionary
The altered layer of soil above the parent material that includes the A and B horizons.
Source: Merriam-Webster